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On BXT/GLK GEN6_PCODE_READ_RC6VIDS fails with MAILBOX_P24C_CC_ILLEGAL_CMD, so don't try to do the query on these platforms. Do it only on SNB, IVB and HSW, where we use this command anyway for RC6 enabling. Based on my tests the command also succeeds on all LLC platforms, but it's not clear if it's really supported on those (it returns 0 aka 245mv for all RC6 states everywhere except on SNB). BSpec lists the command as supported on SKL+ (see P24C_PCODE_MAILBOX_INTERFACE) but that's clearly incorrect, since on SKL/KBL the same command ID is used for SKL_PCODE_LOAD_HDCP_KEYS. Since the command fails on BXT/GLK, the BSpec command list is also incorrect for those platforms (see P_CR_P24C_PCODE_MAILBOX_INTERFACE_0_2_0_GTTMMADR). I filed a request to update that info in Bspec, but for now let's assume a minimal set of platforms where the command is supported. References: https://bugs.freedesktop.org/show_bug.cgi?id=103337 Signed-off-by: Imre Deak <imre.deak@intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20180208174102.10240-1-imre.deak@intel.com |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.